Inflatable ball chair



FIG. 1 is a top front perspective view of an inflatable ball chair showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a rear elevation view thereof. 

The ornamental design for an inflatable ball chair, as shown. 